screen

The class of screen objects. There is only a single screen instance,
which is automatically created when Common Graphics is initialized
with initialize-cg. (A
possible future enhancement would support multiple monitors, each of
which would have its own screen.)

The screen object is returned by the expression (screen
*system*) (see screen and *system*). This object will be returned by
parent when called on a
top-level window, and by owner
when called on a non-owned top-level window.

Drawing may be done on the screen as it is done on a window, though
the drawing code must be wrapped in a with-device-context form. Care should be taken
not to draw on other applications, which this allows.

This class was named windows-screen-device in releases prior to 7.0.

Copyright (c) 1998-2012, Franz Inc. Oakland, CA., USA. All rights reserved.Documentation for Allegro CL version 9.0. This page was not revised from the 8.2 page.Created 2012.5.30.